下列对“吾人咏歌，独惭康乐”中“独惭康乐”的理解，正确的一项是（ ）

It is five years _____his father worked here.

So far, all of the infected people are thought _______ the flu after direct contact with sick birds

It suddenly occurred to him ____ he had left his keys in the office.

Which word has the different ways to pronounce the end -ed